Apparatus for making perspective drawings



July 6,1926.

E. F. HARMER I v AJPARATUS FOR MAKING PERSPECTIVE DRAWINGS Fil ed July 1,3, 1922 Patented July 6, y r e a: i 1 I UNITED STATES "PATENT OFFICE. ERNEsT FREDERICK RARMER, F sonriiailrr'rolv, NGLAND. i APPARATUS FOR MAKING PERSPECTIVE- DRAWVIVNGS. 7 Application filed Jilly l3, 1922, Serial No. 574,744, and Great Britain September 23, 19 21; '7

V V .'FlXed vanishing point. i I i v V H Curved edge of board. V T-square with curved head.

This inventionrelates to a method and means of producing perspective drawings or the like, and has for its object to provide an improved apparatus or device'that will en-' Fixed scale. 7 able perspective drawings, or the like to be Vertical measuring line,

produced Without the construction lines and G. Horizontal line ofvision. geometrical work ordinarily required in The method of usingflthis apparatus'is as 60 producing these drawings. follows-:The plan of the object or build- To attain this object I arrange a board or ing is drawn directjin perspective by means base on which all the essential data such as or a piece of tracing paper'laid over one the Vanishing points measuring lines, and a of the diagrams "AA,; making use of the diagram for facilitating the making of pervanishing point B, or the equivalent C to 65 1 spective plans, are set out in correctrelaensure accuracy, the space between eachf pair tion to each other and from this data the reof radiating lines representing-- the unit of quired perspective can be drawn direct. measurement, which can be subdivided to In accordance with my invention I proany required extent. In the drawing the vide one or more diagrams, representing the lower diagram is the one for use with the 70 plans of horizontal plane surfaces divided 7 board in the position shown,'the upper one into units of measurements in two .direcbeing used if the boardisreversed.

tions at rightangles to each other, as'they The various points and lines are then would appear in perspective, at any parprojected on to the required drawing by ticular angle to the picture plane, and at means of an ordinary T-square, working the sides of the board or base corresponding from top or bottom edge of the board. 7 vanishing-points or their equivalent on the The vertical heights of points and lines {escrow line of horizontal vision. "arethen measured by means of an ordinary lvVhere a vanishing point occurs outside scale laid upon the measuring line (F), or

the area of the board or base I make use by means of an equivalent scale drawn zit-$ of any'suitable form of centrolinead'prefthe side of the .apparatus (-E), using the erably the following vanishing points provided to rule the said so The edge of the board is curved and lines by and in this way the required per-.

around this curved edge a .T-square with spective drawing is. obtained. The intercurved head moves forming radiating lines section of the thickened lines shows a sug- 1 which coincide with'those drawn from'the gested 'position'ior the angle of a building vanishing point. or the like.

The top and bottom edges of the'board I claim I are formed as straight edges so that an or A perspective drawing outfit comprising dinary T-square can be used to project the a drawing board having a portion of one 9- various lines and points from the perspecside edge curved'inwardly upon the arc-of tive plan or diagram on to the perspective a .circle-and adapted to be engaged by the drawing that is being made. head of a Tsquare .with the blade portion Verticaldistances are measured either'in of theeT-square extending radially of said the usual way bymeans of an ordinary scale curved edge across the board, and plotting on the central measuring line F or altercharts upon the end portions of saidboard natively a vertical scale E can be fixed on with a drawing space between them, each of I V 45 the board itself and projected on the drawsaid charts having lines radiating from two ing by means of the radiating T-square on vanishing points one of which co-incides the curved edge or an ordinary ruler ap with the center of said circle and the other plied to the fixed vanishing point B atjthe of which is positioned Within the confines or" opposite edge, with a corresponding scale, the board.

50 on the other side. t 'In J testimony whereof he has aflixed his:

"Inthe accompanying drawing signature.

AA. Diagrams for making plans in a 1; y I g perspective. ER'NEST FREDERICK HARMER V 

